Then the guy may be definitely lost for windsurf. You'd rather give him a try with some used gear and good advices. Personally I started on a short board and 5.2 mē in a solid F4/5. It was so much fun and faster than beginner's gear in F2 that I immediately felt into it. If the guy has enough fit and feeling for kite, why not convert him? We may discover WS is not that difficult, after all...